We demonstrate a quantum nanophotonics platform based on germanium-vacancy (GeV) color centers in fiber-coupled diamond nanophotonic waveguides. We show that GeV optical transitions have a high quantum efficiency and are nearly lifetime-broadened in such nanophotonic structures. These properties yield an efficient interface between waveguide photons and a single GeV without the use of a cavity or slow-light waveguide. As a result, a single GeV center reduces waveguide transmission by 18±1% on resonance in a single pass. We use a nanophotonic interferometer to perform homodyne detection of GeV resonance fluorescence. By probing the photon statistics of the output field, we demonstrate that the GeV-waveguide system is nonlinear at the single-photon level.
@article{arxiv.1612.03036,
title = {Quantum Nonlinear Optics with a Germanium-Vacancy Color Center in a Nanoscale Diamond Waveguide},
author = {Mihir K. Bhaskar and Denis D. Sukachev and Alp Sipahigil and Ruffin E. Evans and Michael J. Burek and Christian T. Nguyen and Lachlan J. Rogers and Petr Siyushev and Mathias H. Metsch and Hongkun Park and Fedor Jelezko and Marko Lončar and Mikhail D. Lukin},
journal= {arXiv preprint arXiv:1612.03036},
year = {2017}
}
Comments
5 pages and 5 figures. Supplemental Material, 4 pages and 1 figure, available as an ancillary file